package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listTree() {
        List<CategoryEntity> categoryEntityList = this.list();
        List<CategoryEntity> result = categoryEntityList.stream()
                .filter(e -> e.getCatLevel() == 1)
                .peek(e -> e.setChildrens(getChildrens(e, categoryEntityList)))
                .sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort())))
                .collect(Collectors.toList());
        return result;
    }

    @Override
    public void removeMenuByIds(Long[] catIds) {
        // todo 判断是否被引用
        baseMapper.deleteBatchIds(Arrays.asList(catIds));
    }

    private List<CategoryEntity> getChildrens(CategoryEntity pmenu, List<CategoryEntity> categoryEntityList) {
        List<CategoryEntity> childrens = categoryEntityList.stream()
                .filter(e -> Objects.equals(e.getParentCid(), pmenu.getCatId()))
                .peek(e -> e.setChildrens(getChildrens(e, categoryEntityList)))
                .sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort())))
                .collect(Collectors.toList());
        return childrens;
    }

}